hey guys
i have been pretty absent from the site for awhile now but thats only because i have been busting ass in the shop. thought i would show you guys a header i made for a 1.8L DOHC honda. everything was done for a reason. the primaries were done like that as an extension of the ports, and are sized to the engine and it's powerband. when you look inside the collector, that was done to prevent reversion. this header also recieved a ported venturi after the collector. look for dyno results within 2 weeks. i think it will make at least 10+whp over the DC 4-2-1 it will be tested against. enjoy!!

That collector is a pipe flow annalyst's nightmare, but looks good overall. How did he size the pipes? Did he do any pipe tuning of sorts, or just copy an idea that was already in use and modify it for himself? just curious, not bashing on your friend of course. I can't be overly critical, because I have no idea how to even weld yet. next on my to learn list. props to your friend for being a cool enough guy to make you a header. now you just need another sheetmetal master friend to fab you some nice front fenders to cover those big slicks.

Originally posted by 92CivicCx@Jun 18 2005, 09:14 AMhe is going to school for automotive engineering so i think he did everything for a reason... also he runs a crab setup on his eg and he talks to people like bisimoto i am sure he knows whats up

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I'm just saying that there are better ways to prevent flow reversion, which is the reason he stated for doing the collector that way. a properly designed venturi would easily take care of the flow reversion problem, but I'm glad he is going to school in that particuar field. Like I said, I wasn't knocking him, just saying from an aerodynamics viewpoint, coming from someone with a background in aero, that pipe flow at that collector will be a major bottleneck in his design. I'm sure he'll find that out when he hits his fluid dynamics courses. But good job so far. I wish I had a buddy that would make me headers. I'm jealous